Description

Reactive Yellow 139 is a high-performance, water-soluble reactive dye belonging to the vinyl sulfone class, widely recognized for its excellent color fastness and brilliant yellow hue. Its primary value lies in its ability to form a strong covalent bond with cellulose fibers, ensuring outstanding wash and light fastness in the final textile product. This dye is essential for manufacturers in the textile industry, particularly for dyeing and printing cotton, viscose, and other cellulosic fabrics, where consistent color yield and durability are critical.

Application

• Exhaust dyeing of cotton yarn and knitted fabrics.
• Continuous pad-steam and pad-batch dyeing of woven cellulosic fabrics.
• Textile printing applications on cotton and viscose.
• Dyeing of regenerated cellulose fibers like lyocell and modal.
• Used in formulations for creating specific shades of yellow and green in combination with other reactive dyes.
• Suitable for applications requiring high wet fastness properties, such as in home textiles and apparel.

Basic Information

Product Name	Reactive Yellow 139
CAS No.	91254-19-2
Molecular Formula	C29H19ClN7Na4O19S6
Molecular Weight	1135.28 g/mol
Synonyms	Reactive Yellow M-5R; C.I. Reactive Yellow 139; Reactive Golden Yellow M-5R; Reactive Yellow M5R; Vinylsulfone Reactive Yellow 139; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our Reactive Yellow 139 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Every lot is tested for critical parameters including color strength, shade, solubility, and fixation properties. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and application performance is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the original container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellow to brownish-yellow powder
Color Strength	100 ± 3% (Standard)
Solubility in Water	≥ 100 g/L (50°C)
pH (1% Solution)	6.0 - 8.0
Moisture Content	≤ 5.0%
Dusting Property	Low
Fixation Rate	≥ 70% (Standard conditions on cotton)
Fastness Properties (on cotton)	Wash: 4-5; Light: 5-6; Rubbing: 4-5

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.